Felipe Massa on Thursday admitted he is in talks with Williams.
Earlier, a Brazilian website said Massa, 32, has rescued his F1 career with a five-year deal starting in 2014.
The report said the Paulista, who has driven for Ferrari since 2006, will replace Pastor Maldonado.
That would tie in with speculation Massa's move is being powered by the former Williams sponsor Petrobras, a Brazilian oil company, whose branding would clash with Venezuela's PDVSA.
Venezuelan oil company PDVSA, locked in a sports backing corruption scandal but with a lucrative Williams contract until 2015, is reportedly in talks now to exit the deal.
Poised with his Brazilian dollars, then, Massa is waiting.
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